Currently, I'm trying to convert my old forum which is running on PHP-Nuke 8.1 to SMF 2.0 Final. When I have done all pre-converting duties, like backing up current forum/database, installed a fresh copy of SMF 2.0 and run the converter, the conversion seems to go OK, besides some messages about missing avatars. After the conversion the userbase is filled and so are the boards. But when I check the boards, the topic numbers are there but the topics are gone. The same goes for the userbase. Database is filled, memberlist is correct but the stats give only one user (me).

Thanks for your suggestions but these didn't do the trick for me. I did get the conversion done by removing SMF2.0 (and it's db content) and installing SMF 1.1.14, downloaded the SMF1 converter (2 files in one archive) somewhere from this site and the conversion went OK. Then I upgraded to 2.0 Final and as far as I can see, it works as it should be.